Abstract
Abstract Rheological properties of a concentrated surfactant system were determined. Flow curves for a fluid composed of an alkylbenzene sulfonate, hydrocarbon, water, and cosurfactant were obtained as a function of the amount of water added to the system. All fluids were optically clear and phase stable. Compositions that can be classified as oil-external microemulsions were found to exhibit Newtonian flow behavior. Non-Newtonian flow was observed for those compositions that were in the oil-external to water-external transition region. Certain compositions in this region showed a discontinuity in the flow data suggesting a sudden transition from the lamellar structure of the phase inversion region to spherical droplets of water-in-oil.
Published Version
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